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Although the 220 Swift was originally based on the 6mm Lee Navy or 236 there are quite a few differences that would make necking the 220 Swift back up to 6mm far from easy.

Firstly the 6mm Navy...

Marty that is a fine piece of wood on that No1. Having the red buttplate suggests that it is an earlier rifle?

Back in 1979 I bought a new Ruger M77 in 220 Swift which still sits in my safe alongside three 22-250s. As far as velocity goes it is a lot easier to propel a 55 grain projectile at well over 3700...